OpenStack Compute (nova)

Where does AMQP come into play?

Asked by HP

So I made calls to openstack through ec2, like *euca-describe-images* and *euca-run-instances*, traced how the call went through the system by looking at logs, and never see AMQP come into play. It looks like nova-api calls nova-compute, nova-network directly... I know that nova uses carrot framework to work with rabbitmq, and found two modules that implement rpc calls (rpc.py and fakerabbit.py).

Here is how I see the process of running an instance:
1. Call made through euca, goes through ec2 log request, authenticate adminrequest authorizer ec2executor,
2. ec2executor calls APIRequest.invoke(...), which calls ec2 cloud CloudController.run_instances, which then uses an instance of compute.API to execute method create(...)..., then _format_run_instances(...), then _format_instances(...).

Did not see any AMQP whatsoever.
Guide me please; what did I miss here?

Thanks

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Vish Ishaya (vishvananda) said : 		#1

API uses rpc.cast and rpc.call to send a message to nova-compute. Nova compute runs a ComputeManager wrapped in a service.Service which listens for messages sent via rpc.cast and rpc.call

Vish

On Jul 25, 2011, at 11:56 AM, HP wrote:

> New question #165968 on OpenStack Compute (nova):
> https://answers.launchpad.net/nova/+question/165968
>
> So I made calls to openstack through ec2, like *euca-describe-images* and *euca-run-instances*, traced how the call went through the system by looking at logs, and never see AMQP come into play. It looks like nova-api calls nova-compute, nova-network directly... I know that nova uses carrot framework to work with rabbitmq, and found two modules that implement rpc calls (rpc.py and fakerabbit.py).
>
> Here is how I see the process of running an instance:
> 1. Call made through euca, goes through ec2 log request, authenticate adminrequest authorizer ec2executor,
> 2. ec2executor calls APIRequest.invoke(...), which calls ec2 cloud CloudController.run_instances, which then uses an instance of compute.API to execute method create(...)..., then _format_run_instances(...), then _format_instances(...).
>
> Did not see any AMQP whatsoever.
> Guide me please; what did I miss here?
>
> Thanks
>
> --
> You received this question notification because you are a member of Nova
> Core, which is an answer contact for OpenStack Compute (nova).

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